add wan alpha tutorial

Author: Square-Zero-Labs

Runpod-Docker/tutorials/wan-alpha.md

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+# Wan-Alpha Tutorial
+
+Use this quick reference to capture the key settings and workflow from [the companion YouTube tutorial](https://youtu.be/MbA1iUBHQzY).
+
+## Install Unzip (ubuntu)
+
+```bash
+apt update
+apt install unzip
+```
+
+## ffmpeg commands
+
+To assemble a .mov file:
+
+```bash
+ffmpeg -framerate 24 -pattern_type glob -i 'img_*.png' \
+  -vf format=rgba \
+  -c:v prores_ks -profile:v 4444 -pix_fmt yuva444p10le -alpha_bits 16 \
+  wan_alpha_transparent.mov
+```
+
+If your video has a gray background after running the above command, run:
+
+```bash
+ffmpeg -i wan_alpha_transparent.mov -c:v prores_ks -profile:v 4444 \
+       -pix_fmt yuva444p10le -alpha_bits 16 \
+       fixed_wan_alpha_transparent.mov
+```
+
+To assemble a .webm file (for web assets):
+
+```bash
+ffmpeg -framerate 24 -pattern_type glob -i 'img_*.png' \
+  -vf "format=rgba" \
+  -c:v libvpx-vp9 -lossless 1 -pix_fmt yuva420p \
+  wan_alpha_transparent.webm
+```
+
+## Prompts
+
+#### For golden retriever:
+
+This video has a transparent background. A golden retriever puppy with fine, dense fur sways in the wind, its tail gently wagging. Realistic style. Medium shot.
+
+#### For blonde woman:
+
+This video has a transparent background. An attractive blonde woman, dressed in a stylish urban business suit, smiles as a gentle breeze rustles her long, flowing blonde hair, sending strands flying. Her eyes are gentle and vibrant, and a contented smile plays on her lips. Realistic style. Medium shot. Slight upward angle.
+
+#### For emoji motion graphic:
+
+This video has a transparent background. A cheerful round yellow emoji face. The emoji winks one eye, then its cheeks softly blush pink while its mouth curls into a shy but happy smile. Clean modern digital art style. Close-up shot.
+
+#### For dog motion graphic:
+
+This video has a transparent background. A cheerful cute puppy wags its tail and then runs away. Clean modern digital art style. Close-up shot.